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Re:Goldman Sachs Is Setting Up a Cryptocurrency Trading Desk by Huhuh on Thursday December 21, 2017 @09:59PM (#15984924)
Let's have a look.

ac15f66716f6df73a2d2a54e207e3d64ebc30570367d39e7bf8c56e5f337aaeb

Re:Goldman Sachs Is Setting Up a Cryptocurrency Trading Desk by MadSudaca on Thursday December 21, 2017 @10:06PM (#15984955)
It seems that's an invalid address, and the protocol doesn't let you send to invalid addresses. Moreover, it should be prefixed by a xrb_.